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Reversible formation of stacking faults in a nickel-based single crystal TMS-82 superalloy

机译：镍基单晶TMS-82高温合金中堆垛层错的可逆形成

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摘要

Thermomechanical fatigue (TMF) tests have been carried out in a nickel-based single crystal TMS-82 superalloy, and the dynamic evolutions of dislocations and stacking faults have been studied in detail. It is found that the reversible formation of stacking faults is always associated with the loading orientation. Specifically, stacking faults expand under compression and shrink under tension due to the disappearance and appearance of dislocations during the TMF process. Stacking faults result from shear of y' precipitates by 1/3<112> dislocations, which arise from the decomposition of 1/2<110> matrix dislocations. The calculations of critically resolved shear stress to push dislocations that glide in the y' particles confirm the expansion of stacking faults under compression. However, under tension, dislocations in y channel prevent 1/2<110> dislocations to enter y' cuboids and consequently, stacking faults shrink. Appearance and disappearance of dislocations during TMF cycling are associated with plastic deformation and annealing process, respectively.
机译：已经在镍基单晶TMS-82高温合金中进行了热机械疲劳（TMF）测试，并详细研究了位错和堆垛层错的动态演变。发现堆垛层错的可逆形成总是与载荷方向有关。具体来说，由于TMF过程中位错的消失和出现，堆垛层错在压缩作用下膨胀，在张力作用下收缩。堆垛层错是由y'析出物剪切1/3 <112>位错引起的，这是由1/2 <110>矩阵位错的分解引起的。临界解析剪切应力以推动在y'粒子中滑动的位错的计算结果证实了压缩作用下堆垛层错的扩展。但是，在张力下，y通道中的位错阻止1/2 <110>位错进入y'长方体，因此堆垛层错缩小。 TMF循环中位错的出现和消失分别与塑性变形和退火过程有关。

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  • 来源
    《Journal of Materials Research》 |2013年第24期|3332-3338|共7页
  • 作者

    Xianzi Lv; Jianxin Zhang; Hiroshi Harada;

  • 作者单位

    Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, China;

    Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, China;

    High Temperature Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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